If Phase Linearity; Input Attenuation Switching Uncertainty - Keysight M9290A Manual

Description
(Demodulation and FFT
response relative to the center
frequency)
Center Analysis
Freq (GHz) Width (MHz)
3.0 10
3.0, 26.5 10
a.
The IF frequency response includes effects due to RF circuits such as input filters, that are a function of RF frequency, in
addition to the IF pass-band effects.
b. The maximum error at an offset (f) from the center of the FFT width is given by the expression  [Midwidth Error + (f ×
Slope)], but never exceeds Max Error. Usually, the span is no larger than the FFT width in which case the center of the
FFT width is the center frequency of the analyzer. When the analyzer span is wider than the FFT width, the span is made up
of multiple concatenated FFT results, and thus has multiple centers of FFT widths so the f in the equation is the offset from
the nearest center. These specifications include the effect of RF frequency response as well as IF frequency response at the
worst case center frequency. Performance is nominally three times better than the maximum error at most center
frequencies.
c.
The specification does not apply for frequencies greater than 3.0 MHz from the center in FFT Widths of 7.2 to 8 MHz.
d. The "RMS" nominal performance is the standard deviation of the response relative to the center frequency, integrated across
a 10 MHz span. This performance measure was observed at a single center frequency in each harmonic mixing band, which
is representative of all center frequencies; the observation center frequency is not the worst case center frequency.
Description

IF Phase Linearity

Freq Span
(GHz) (MHz)
0.02,  3.0  10
3.0, 7.5  10
a.
The listed performance is the r.m.s. of the phase deviation relative to the mean phase deviation from a linear phase
condition, where the r.m.s. is computed over the range of offset frequencies and center frequencies shown.
Description

Input Attenuation Switching Uncertainty

(Relative to 10 dB (reference setting))
50 MHz (reference frequency)
Attenuation > 2 dB, preamp off
100 kHz to 3 GHz
3 to 7.5 GHz
7.5 to 26.5 GHz
Specifications Supplemental Information
b
Max Error Midwidth Error
c
(Exception ) (95th Percentile)
0.40 dB 0.12 dB
Specification
Specifications
0.30 dB
Slope (dB/MHz)
(95th Percentile)
0.10
Supplemental Information
Peak-to-Peak
(nominal) RMS (nominal)
0.5 0.2
0.5 0.4
Supplemental Information
Refer to the footnote for
Overlaps" on page 12
0.15 dB (typical)
0.30 dB (nominal)
0.50 dB (nominal)
0.70 dB (nominal)
d
RMS
(nominal)
0.03 dB
0.1 dB
a
"Band
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